http://reply.papertrans.cn/1/80/7917/7917-31.png
Submitted on: 20 May 1998.
Revised on: 31 July 1998.
Accepted on: 17 August 1998.
___________________Economic and Environmental Geology
http://reply.papertrans.cn/1/80/7917/7917-33.png
Submitted on: 25 May 2015.
Revised on: 29 August 2015.
Accepted on: 29 September 2015.
___________________Economic and Environmental Geology
Submitted on: 01 August 2012.
Revised on: 24 November 2012.
Accepted on: 10 December 2012.
___________________Economic and Environmental Geology
Submitted on: 24 May 2009.
Revised on: 07 September 2009.
Accepted on: 23 September 2009.
___________________Economic and Environmental Geology